Ideas
You can use the information to help you come up with more diverse NPC submissions if you would like! Stats are what I have a lot of, and need/have a lot of are lists that you don't NEED to follow, but something to keep in mind. A well thought out character that uses one of the "have a lots" is fine.

Have a lot of:
Team Members, Adventurers, Explorers
Eevee and its evolutions
Pure good characters (kind, friendly, etc with no negative qualities or quirks)

One Zubat
Another Zubat
Yet Another Zubat
Better Throw In Another Zubat
Dude, Can You Stop With All The Zubat
It Can't Be Another Zubat
You Are A Scourge Upon The World, Zubat
...SURPRISE Zubat
Look, I Just Want An Accurate Number Of Zubat
I'll Stop As Soon As Nintendo Does Zubat

As for your second question--quite the opposite most of the time. If 100 characters are X, then for the sake of diversity I wouldn't pick as many of those. That goes for species, as well as profession and personality. Obviously, this depends. If we're in a cave, a Zubat would stand a better chance than Pikachu.